Helen discovers that her friend Olivia is addicted to meth. Olivia urges Helen not to tell anyone about it. As Helen watches Olivia slip further into addiction, she wonders if she should tell campus officials in order to get help for Olivia. Helen’s situation is most clearly an example of . . .

Explanation:

A psychological disease in which a person becomes habituated in using a particular thing continuously is called addiction.

Drugs are chemical compounds which are often used to treat certain medical condition.

But these compounds are often very addictive and if a person develops an addiction towards it it causes ill effects on his mental, physical and social health. Such misuse of drugs is then called drug abuse. Drug abuse is a legal offence and a drug addict must seek for psychological and medical assistance to give up the addiction.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?